As far as I know, the industry standard is 60 for captains and 65 for copilots, with the exceptions above. There doesn't seem to be a limit on the age of a flight engineer. Industrial agreements and pension contracts also come into play at BA and other big operators to force retirement at 55. In European we have do have some trainers and management pilots flying in command over 60, but limited geographically - all very experienced guys who pass their sim. checks and medicals. Isn't there some legislation in the pipeline about the right to work past 65? I'm not sure if it will apply to aircrew, though.
Cheers, Yotter